pub enum RawEntryMut<'a, K, V, S, A = Global> where
A: Allocator + Clone, {
Occupied(RawOccupiedEntryMut<'a, K, V, S, A>),
Vacant(RawVacantEntryMut<'a, K, V, S, A>),
}
Expand description
A view into a single entry in a map, which may either be vacant or occupied.
This is a lower-level version of Entry
.
This enum
is constructed through the raw_entry_mut
method on HashMap
,
then calling one of the methods of that RawEntryBuilderMut
.
Variants
Occupied(RawOccupiedEntryMut<'a, K, V, S, A>)
An occupied entry.
Vacant(RawVacantEntryMut<'a, K, V, S, A>)
A vacant entry.
Implementations
impl<'a, K, V, S, A> RawEntryMut<'a, K, V, S, A> where
A: Allocator + Clone,
impl<'a, K, V, S, A> RawEntryMut<'a, K, V, S, A> where
A: Allocator + Clone,
pub fn insert(self, key: K, value: V) -> RawOccupiedEntryMut<'a, K, V, S, A> where
K: Hash,
S: BuildHasher,
pub fn insert(self, key: K, value: V) -> RawOccupiedEntryMut<'a, K, V, S, A> where
K: Hash,
S: BuildHasher,
Sets the value of the entry, and returns a RawOccupiedEntryMut.
Examples
use hashbrown::HashMap;
let mut map: HashMap<&str, u32> = HashMap::new();
let entry = map.raw_entry_mut().from_key("horseyland").insert("horseyland", 37);
assert_eq!(entry.remove_entry(), ("horseyland", 37));
pub fn or_insert(self, default_key: K, default_val: V) -> (&'a mut K, &'a mut V) where
K: Hash,
S: BuildHasher,
pub fn or_insert(self, default_key: K, default_val: V) -> (&'a mut K, &'a mut V) where
K: Hash,
S: BuildHasher,
Ensures a value is in the entry by inserting the default if empty, and returns mutable references to the key and value in the entry.
Examples
use hashbrown::HashMap;
let mut map: HashMap<&str, u32> = HashMap::new();
map.raw_entry_mut().from_key("poneyland").or_insert("poneyland", 3);
assert_eq!(map["poneyland"], 3);
*map.raw_entry_mut().from_key("poneyland").or_insert("poneyland", 10).1 *= 2;
assert_eq!(map["poneyland"], 6);
pub fn or_insert_with<F>(self, default: F) -> (&'a mut K, &'a mut V) where
F: FnOnce() -> (K, V),
K: Hash,
S: BuildHasher,
pub fn or_insert_with<F>(self, default: F) -> (&'a mut K, &'a mut V) where
F: FnOnce() -> (K, V),
K: Hash,
S: BuildHasher,
Ensures a value is in the entry by inserting the result of the default function if empty, and returns mutable references to the key and value in the entry.
Examples
use hashbrown::HashMap;
let mut map: HashMap<&str, String> = HashMap::new();
map.raw_entry_mut().from_key("poneyland").or_insert_with(|| {
("poneyland", "hoho".to_string())
});
assert_eq!(map["poneyland"], "hoho".to_string());
pub fn and_modify<F>(self, f: F) -> RawEntryMut<'a, K, V, S, A> where
F: FnOnce(&mut K, &mut V),
pub fn and_modify<F>(self, f: F) -> RawEntryMut<'a, K, V, S, A> where
F: FnOnce(&mut K, &mut V),
Provides in-place mutable access to an occupied entry before any potential inserts into the map.
Examples
use hashbrown::HashMap;
let mut map: HashMap<&str, u32> = HashMap::new();
map.raw_entry_mut()
.from_key("poneyland")
.and_modify(|_k, v| { *v += 1 })
.or_insert("poneyland", 42);
assert_eq!(map["poneyland"], 42);
map.raw_entry_mut()
.from_key("poneyland")
.and_modify(|_k, v| { *v += 1 })
.or_insert("poneyland", 0);
assert_eq!(map["poneyland"], 43);
pub fn and_replace_entry_with<F>(self, f: F) -> RawEntryMut<'a, K, V, S, A> where
F: FnOnce(&K, V) -> Option<V>,
pub fn and_replace_entry_with<F>(self, f: F) -> RawEntryMut<'a, K, V, S, A> where
F: FnOnce(&K, V) -> Option<V>,
Provides shared access to the key and owned access to the value of an occupied entry and allows to replace or remove it based on the value of the returned option.
Examples
use hashbrown::HashMap;
use hashbrown::hash_map::RawEntryMut;
let mut map: HashMap<&str, u32> = HashMap::new();
let entry = map
.raw_entry_mut()
.from_key("poneyland")
.and_replace_entry_with(|_k, _v| panic!());
match entry {
RawEntryMut::Vacant(_) => {},
RawEntryMut::Occupied(_) => panic!(),
}
map.insert("poneyland", 42);
let entry = map
.raw_entry_mut()
.from_key("poneyland")
.and_replace_entry_with(|k, v| {
assert_eq!(k, &"poneyland");
assert_eq!(v, 42);
Some(v + 1)
});
match entry {
RawEntryMut::Occupied(e) => {
assert_eq!(e.key(), &"poneyland");
assert_eq!(e.get(), &43);
},
RawEntryMut::Vacant(_) => panic!(),
}
assert_eq!(map["poneyland"], 43);
let entry = map
.raw_entry_mut()
.from_key("poneyland")
.and_replace_entry_with(|_k, _v| None);
match entry {
RawEntryMut::Vacant(_) => {},
RawEntryMut::Occupied(_) => panic!(),
}
assert!(!map.contains_key("poneyland"));
Trait Implementations
Auto Trait Implementations
impl<'a, K, V, S, A> RefUnwindSafe for RawEntryMut<'a, K, V, S, A> where
A: RefUnwindSafe,
K: RefUnwindSafe,
S: RefUnwindSafe,
V: RefUnwindSafe,
impl<'a, K, V, S, A> Send for RawEntryMut<'a, K, V, S, A> where
A: Send,
K: Send,
S: Sync,
V: Send,
impl<'a, K, V, S, A> Sync for RawEntryMut<'a, K, V, S, A> where
A: Send,
K: Sync,
S: Sync,
V: Sync,
impl<'a, K, V, S, A> Unpin for RawEntryMut<'a, K, V, S, A>
impl<'a, K, V, S, A = Global> !UnwindSafe for RawEntryMut<'a, K, V, S, A>
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
impl<T> Downcast for T where
T: Any,
impl<T> Downcast for T where
T: Any,
fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>ⓘNotable traits for Box<F, A>impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;
fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>ⓘNotable traits for Box<F, A>impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;
Convert Box<dyn Trait>
(where Trait: Downcast
) to Box<dyn Any>
. Box<dyn Any>
can
then be further downcast
into Box<ConcreteType>
where ConcreteType
implements Trait
. Read more
fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
Convert Rc<Trait>
(where Trait: Downcast
) to Rc<Any>
. Rc<Any>
can then be
further downcast
into Rc<ConcreteType>
where ConcreteType
implements Trait
. Read more
fn as_any(&self) -> &(dyn Any + 'static)
fn as_any(&self) -> &(dyn Any + 'static)
Convert &Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &Any
’s vtable from &Trait
’s. Read more
fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
Convert &mut Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &mut Any
’s vtable from &mut Trait
’s. Read more
sourceimpl<T> Instrument for T
impl<T> Instrument for T
sourcefn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
fn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
T: Future, type Output = <T as Future>::Output;
sourcefn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
fn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
T: Future, type Output = <T as Future>::Output;
impl<V, T> VZip<V> for T where
V: MultiLane<T>,
impl<V, T> VZip<V> for T where
V: MultiLane<T>,
fn vzip(self) -> V
sourceimpl<T> WithSubscriber for T
impl<T> WithSubscriber for T
sourcefn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
where
S: Into<Dispatch>,
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
where
S: Into<Dispatch>,
T: Future, type Output = <T as Future>::Output;
Attaches the provided Subscriber
to this type, returning a
WithDispatch
wrapper. Read more
sourcefn with_current_subscriber(self) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
fn with_current_subscriber(self) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
T: Future, type Output = <T as Future>::Output;
Attaches the current default Subscriber
to this type, returning a
WithDispatch
wrapper. Read more